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Journal of Histochemistry and Cytochemistry, Vol. 46, 379-388, Copyright © 1998, The Histochemical Society, Inc.
Localization of Transforming Growth Factor-b1 and Type II Receptor in Developing Normal Human Prostate and Carcinoma Tissues
Michael J. Gerdesa,
Melinda Larsenb,
Lauren McBridea,
Truong D. Danga,
Bing Lua, and
David R. Rowleya,b
a Department of Cell Biology, Baylor College of Medicine, Houston, Texas 77030
b Cell and Molecular Biology Program, Baylor College of Medicine, Houston, Texas 77030
Correspondence to:
David R. Rowley, Dept. of Cell Biology, 466A, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030.
Transforming growth factor-ß1 (TGF-ß1) is implicated in prostate development, and elevated expression of TGF-ß1 has been correlated with prostate carcinogenesis. In this study, cell type specificity of TGF-ß1 and TGF-ß receptor Type II (RcII) protein expression was determined by immunocytochemistry in human normal prostate and compared to prostate carcinoma tissues. Heterogeneous localization patterns of LAP-TGF-ß1 (TGF-ß1 precursor) and RcII were observed in both epithelial and mesenchymal cells in fetal prostate, with LAP-TGF-ß1 localizing to more basal epithelial cells. Homogeneity of LAP-TGF-ß1 staining was increased in neonatal, prepubertal, and adult prostate, with elevated immunoreactivity noted in epithelial acini relative to stromal tissue for both LAP-TGF-ß1 and RcII proteins. In stromal tissues, RcII cell localization exhibited staining patterns nearly identical to smooth muscle -actin. In prostate carcinoma, LAP-TGF-ß1 localized to carcinoma cells with an increased staining heterogeneity relative to normal prostate. In contrast to normal epithelial cells, carcinoma epithelial cells exhibited low to nondetectable RcII staining. Stromal cell staining patterns for LAP-TGF-ß1 and RcII in carcinoma, however, were identical to those of normal prostate stromal cells. These studies implicate both epithelial and stromal cells as sites of TGF-ß1 synthesis and RcII localization in the developing and adult normal human prostate. In addition, these data indicate a loss of epithelial expression of RcII concurrent with altered LAP-TGF-ß1 expression in human prostate carcinoma cells. (J Histochem Cytochem 46:379388, 1998)
Key Words:
TGF-ß1, TGF-ß receptor type II, prostate, human, cancer, development

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The Journal of Histochemistry & Cytochemistry
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